Timberline Proudly Offers Integrity

If you live on the North Shore, there is a Timberline near you. Stop by our Gloucester, Beverly, Newburyport or Billerica locations and see how Integrity Windows and Doors from Marvin can offer limitless options for your building project and can create the distinctive entrance and doorways of your dreams with expert craftsmanship, architectural details, and the very highest quality.

Why Choose Integrity
Integrity windows and doors are made with Ultrex®, a pultruded fiberglass Marvin has patented that outperforms and outlasts vinyl, roll-form aluminum and other fiberglass composites. Integrity uses Ultrex and a proprietary pultrusion process to manufacture high-demand windows and doors that endure all elements without showing age or wear.

Proven Strength
The facts prove it. Ultrex fiberglass is eight times stronger than vinyl and three times stronger than vinyl/wood composites. It resists fading, chalking, peeling and cracking, giving you unparalleled strength and durability. Integrity is constantly testing Ultrex to prove it’s the toughest window material available.

Built Tough
Integrity windows are Built to Perform® in the face of Mother Nature’s toughest elements. The Ultrex pultruded fiberglass that goes into every Integrity window and door remains stable in extreme temperatures and expands at nearly the same rate as glass, resulting in windows that are strong and true. Fiberglass windows have a 38% longer* useful life expectancy than vinyl.